Validation of PON1 enzyme activity assays for longitudinal studies

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Validation of PON1 enzyme activity assays for longitudinal studies.

BACKGROUND Paraoxonase (PON1) enzymatic activity assays are used to characterize sensitivity to organophosphates and oxidative stress. Length of sample storage, temperature and other factors may influence variability of PON1 measurements, especially in longitudinal studies. METHODS Effects of assay temperature, storage duration up to 7 y (-80 degrees C), freeze-thaw cycles, the type of specim...

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Developmental Changes in PON1 Enzyme Activity in Young Children and Effects of PON1 Polymorphisms

BACKGROUND Paraoxonase 1 (PON1) is an enzyme that detoxifies activated organophosphorus pesticides (OPs) and is also involved in oxidative stress pathways. OBJECTIVES PON1 activity in newborns is lower than in adults, but the ontogeny of PON1 activity is poorly characterized in young children. We examined the effects of age and PON1 genotype on enzyme activity in a birth cohort of Mexican-Ame...

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Future studies of low-activity PON1 phenotype subjects may reveal how PON1 protects against cardiovascular disease.

The article by Jarvik et al, 1 appearing in this issue, illustrates the pros and cons of using a large panel of SNPs for probing deeper into the association between serum paraoxonase (PON1) and vascular disease. The obvious advantages of using such a series of convenient genetic markers are somewhat compromised in this instance by the presence of several, long-ago established recombination site...

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Recent advances in sulfotransferase enzyme activity assays.

Sulfotransferases are enzymes that catalyze the transfer of sulfo groups from a donor, for example 3'-phosphoadenosine 5'-phosphosulfate, to an acceptor, for example the amino or hydroxyl groups of a small molecule, xenobiotic, carbohydrate, or peptide. These enzymes are important targets in the design of novel therapeutics for treatment of a variety of diseases. This review examines assays use...

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An Alkaline Phosphatase Lacking Wheat Germ Agglutinin Binding Sites Useful Enzyme for Lectin Assays with Comparable Activity to the Calf Enzyme

Despite the availability of various alkaline phosphatase (ALP) isoenzymes, the calf enzyme is being used in current enzyme assays as the detector enzyme. The glycosylation pattern of this enzyme makes it a suitable ligand for binding to wheat germ agglutinin lectin (WGA). As a result of this property, the enzyme can not be used as a conjugate with this lectin, and the calf enzyme conjugates can...

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ژورنال

عنوان ژورنال: Clinica Chimica Acta

سال: 2009

ISSN: 0009-8981

DOI: 10.1016/j.cca.2008.12.019